Buff from Gdansk, possibly (6)
I believe the answer is:
polish
'buff' is the definition.
(I know that buff can be written as polish)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for polish that I've seen before include "Smooth or shine by rubbing" , "Refine, language" , "'Buff, burnish (6)'" , "elegance" , "Language (linked to spitting?)" .)